use release namespace for leader election

[aburan28]

Change the way that the leader election namespace is set. Currently the values.yaml file has an option to set the leader election namespace to .Values.leaderElection.namespace but when developers install cert-manager into a different namespace the roles will not have permission to acquire leases in that namespace. This PR simplifies the Roles to use the cert-manager.namespace function which uses .Release.Namespace.

Pull Request Motivation

Attempts to solve the following issue #6716

Kind

Release Note

Removes the .Values.leaderElection.namespace option and switches the leader election namespace to match .Release.Namespace via cert-manager.namespace helm function

[jetstack-bot]

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